Targum Jonathan on Deuteronomy
In his day thou shalt pay him his hire. Nor let the sun go down upon it; because he is poor, and he hopes (for that hire) to sustain his life: lest he appeal against thee before the Lord, and it be guilt in thee.
Targum Jerusalem
In his day thou shalt pay his wages, nor let the sun go down upon them; for he is poor, and by means of his hire he sustaineth his life: that he may not cry against thee before the Lord: so beware that it become not guilt in you.